
/*非常重要的样式让背景图片100%适应整个屏幕*/
.bg {
    display: table;
    width: 100%;
    height: 100%;
    padding: 100px 0;
    text-align: center;
    color: #fff;
    background: url(../img/logo.png) no-repeat bottom center;
    background-color: #000;
    background-size: cover;
}

